Kakl geiser and hans keheli



UNITED STATES Patented September 20, 1904.

PATENT OFFICE.

lNKlNG-CYLINDER.

SPECIFICATION forming part of Letters Patent No. 770,636, datedSeptember 20, 1904.

Application filed January 30, 1904. Serial No. 192,108. (No model.)

To all whom it natty concern.-

Be it known that we,KARL GEIsER and HANS KEHRLI, citizens ofSwitzerland, residing at Berne, in the Republic of Switzerland, haveinvented a certain new and useful Improvement in Inking-Cylinders; andwe do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to an inking-cylinder for printing-presses, inwhich the'substance of the cylinder consists of starch, on the one hand,and either a metal salt containing chlorin or a mixture of metal saltscontaining chlorin, on the other. The manufacture of such a cylinder,for example, is as follows: Concentrated (thirty-five per cent.)solution of chlorid of magnesia and starchfor instance, rice-- starchofequal weight in a cold condition are stirred together for about fiveminutes. This then results in a thick liquid homogeneous mass, which isfiltered through alight cloth and then cast in suitable molds, in whichit is left until hardened. By warming the molds the hardeningprocess canbe hastened. Thorough trials have proven that such cylinders areconsiderably more durable than the cylinders of gelatin substance usedup to the present.

They are also more capable of resistance than these against outsideinfluences of temperature and evince a greater pliability and tractivepower.

Through a small addition of glue and glycerin the tractive power anddurability of the cylinders can be increased. This addition, forinstance, amounts to about two per cent. of the total weight of thecylinder. Of the various metal salts containing chlorin the chlorid ofmagnesia has proven itself to be particularly suitable.

We claim- 1. An inking-cylinder made by compounding equal weights ofstarch and concentrated solution of chlorid of magnesium.

2. An inking-cylinder made by compounding equal weights of starch andconcentrated solution of chlorid of magnesium with about two per centumof glue and glycerin.

In testimony whereof we have aflixed our signatures to thisspecification in the presence of two witnesses.

KARL GEISER. HANS KEHRLI.

Witnesses:

EDUARD VON WALDKIROH, FRIEDRICH NAEGELI.

